Bride Nailah (wow) is the first...seasonal green beast infantry. Looks like she ditches her DC + NCD combo for close combat approaches. She is surely one of the speedy units with that kit, though.
Bride Oboro is somewhat underwhelming red sword infantry because it looked like she was meant to be the temporary demoted unit of the banner (seriously, she only has 4 skills). However, her B skill is heavily coveted.
Groom Rafiel (huh) is a blue singer with perhaps a very sweet support effect of Special cooldown -1. He is the demoted unit.
Duo Couple Micaiah & Sothe (cue
@Psynergy complaining somehow) are the first...seasonal flying colorless tome unit (so now she covers all tome colors!). As always, she's always going to screw armors and infantry something fierce, but she can fight dragons because of Mystic Boost. They can grant Dominance on allies and inflict Def/Res-7 on foes centered in 3 columns to inflict massive damage on debuffed enemies.
Groom Hinata is the axe infantry TT+ prize (really, our second axe in a row?). If he has Fury 3, that...would give unfortunate implications.